factor/basis/cocoa/messages/messages.factor

! Copyright (C) 2006, 2009 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: accessors alien alien.c-types alien.strings arrays assocs
continuations combinators compiler compiler.alien kernel math
namespaces make parser quotations sequences strings words
cocoa.runtime io macros memoize io.encodings.utf8
effects libc libc.private parser lexer init core-foundation fry
generalizations specialized-arrays.direct.alien ;
IN: cocoa.messages

: make-sender ( method function -- quot )
    [ over first , f , , second , \ alien-invoke , ] [ ] make ;

: sender-stub ( method function -- word )
    [ "( sender-stub )" f <word> dup ] 2dip
    over first large-struct? [ "_stret" append ] when
    make-sender define ;

SYMBOL: message-senders
SYMBOL: super-message-senders

message-senders global [ H{ } assoc-like ] change-at
super-message-senders global [ H{ } assoc-like ] change-at

: cache-stub ( method function hash -- )
    [
        over get [ 2drop ] [ over [ sender-stub ] dip set ] if
    ] bind ;

: cache-stubs ( method -- )
    dup
    "objc_msgSendSuper" super-message-senders get cache-stub
    "objc_msgSend" message-senders get cache-stub ;

: <super> ( receiver -- super )
    "objc-super" <c-object> [
        [ dup object_getClass class_getSuperclass ] dip
        set-objc-super-class
    ] keep
    [ set-objc-super-receiver ] keep ;

TUPLE: selector name object ;

MEMO: <selector> ( name -- sel ) f \ selector boa ;

: selector ( selector -- alien )
    dup object>> expired? [
        dup name>> sel_registerName
        [ >>object drop ] keep
    ] [
        object>>
    ] if ;

SYMBOL: objc-methods

objc-methods global [ H{ } assoc-like ] change-at

: lookup-method ( selector -- method )
    dup objc-methods get at
    [ ] [ "No such method: " prepend throw ] ?if ;

MEMO: make-prepare-send ( selector method super? -- quot )
    [
        [ \ <super> , ] when
        swap <selector> , \ selector ,
    ] [ ] make
    swap second length 2 - '[ _ _ ndip ] ;

MACRO: (send) ( selector super? -- quot )
    [ dup lookup-method ] dip
    [ make-prepare-send ] 2keep
    super-message-senders message-senders ? get at
    '[ _ call _ execute ] ;

: send ( receiver args... selector -- return... ) f (send) ; inline

: super-send ( receiver args... selector -- return... ) t (send) ; inline

! Runtime introspection
SYMBOL: class-init-hooks

class-init-hooks global [ H{ } clone or ] change-at

: (objc-class) ( name word -- class )
    2dup execute dup [ 2nip ] [
        drop over class-init-hooks get at [ assert-depth ] when*
        2dup execute dup [ 2nip ] [
            2drop "No such class: " prepend throw
        ] if
    ] if ; inline

: objc-class ( string -- class )
    \ objc_getClass (objc-class) ;

: objc-protocol ( string -- class )
    \ objc_getProtocol (objc-class) ;

: objc-meta-class ( string -- class )
    \ objc_getMetaClass (objc-class) ;

SYMBOL: objc>alien-types

H{
    { "c" "char" }
    { "i" "int" }
    { "s" "short" }
    { "C" "uchar" }
    { "I" "uint" }
    { "S" "ushort" }
    { "f" "float" }
    { "d" "double" }
    { "B" "bool" }
    { "v" "void" }
    { "*" "char*" }
    { "?" "unknown_type" }
    { "@" "id" }
    { "#" "Class" }
    { ":" "SEL" }
}
"ptrdiff_t" heap-size {
    { 4 [ H{
        { "l" "long" }
        { "q" "longlong" }
        { "L" "ulong" }
        { "Q" "ulonglong" }
    } ] }
    { 8 [ H{
        { "l" "long32" }
        { "q" "long" }
        { "L" "ulong32" }
        { "Q" "ulong" }
    } ] }
} case
assoc-union objc>alien-types set-global

! The transpose of the above map
SYMBOL: alien>objc-types

objc>alien-types get [ swap ] assoc-map
! A hack...
"ptrdiff_t" heap-size {
    { 4 [ H{
        { "NSPoint"    "{_NSPoint=ff}" }
        { "NSRect"     "{_NSRect={_NSPoint=ff}{_NSSize=ff}}" }
        { "NSSize"     "{_NSSize=ff}" }
        { "NSRange"    "{_NSRange=II}" }
        { "NSInteger"  "i" }
        { "NSUInteger" "I" }
        { "CGFloat"    "f" }
    } ] }
    { 8 [ H{
        { "NSPoint"    "{CGPoint=dd}" }
        { "NSRect"     "{CGRect={CGPoint=dd}{CGSize=dd}}" }
        { "NSSize"     "{CGSize=dd}" }
        { "NSRange"    "{_NSRange=QQ}" }
        { "NSInteger"  "q" }
        { "NSUInteger" "Q" }
        { "CGFloat"    "d" }
    } ] }
} case
assoc-union alien>objc-types set-global

: objc-struct-type ( i string -- ctype )
    [ CHAR: = ] 2keep index-from swap subseq
    dup c-types get key? [
        "Warning: no such C type: " write dup print
        drop "void*"
    ] unless ;

ERROR: no-objc-type name ;

: decode-type ( ch -- ctype )
    1string dup objc>alien-types get at
    [ ] [ no-objc-type ] ?if ;

: (parse-objc-type) ( i string -- ctype )
    [ [ 1+ ] dip ] [ nth ] 2bi {
        { [ dup "rnNoORV" member? ] [ drop (parse-objc-type) ] }
        { [ dup CHAR: ^ = ] [ 3drop "void*" ] }
        { [ dup CHAR: { = ] [ drop objc-struct-type ] }
        { [ dup CHAR: [ = ] [ 3drop "void*" ] }
        [ 2nip decode-type ]
    } cond ;

: parse-objc-type ( string -- ctype ) 0 swap (parse-objc-type) ;

: method-arg-type ( method i -- type )
    method_copyArgumentType
    [ utf8 alien>string parse-objc-type ] keep
    (free) ;

: method-arg-types ( method -- args )
    dup method_getNumberOfArguments
    [ method-arg-type ] with map ;

: method-return-type ( method -- ctype )
    method_copyReturnType
    [ utf8 alien>string parse-objc-type ] keep
    (free) ;

: register-objc-method ( method -- )
    dup method-return-type over method-arg-types 2array
    dup cache-stubs
    swap method_getName sel_getName
    objc-methods get set-at ;

: each-method-in-class ( class quot -- )
    [ 0 <uint> [ class_copyMethodList ] keep *uint ] dip
    over 0 = [ 3drop ] [
        [ <direct-void*-array> ] dip
        [ each ] [ drop underlying>> (free) ] 2bi
    ] if ; inline

: register-objc-methods ( class -- )
    [ register-objc-method ] each-method-in-class ;

: class-exists? ( string -- class ) objc_getClass >boolean ;

: define-objc-class-word ( quot name -- )
    [ class-init-hooks get set-at ]
    [
        [ "cocoa.classes" create ] [ '[ _ objc-class ] ] bi
        (( -- class )) define-declared
    ] bi ;

: import-objc-class ( name quot -- )
    over define-objc-class-word
    [ objc-class register-objc-methods ]
    [ objc-meta-class register-objc-methods ] bi ;

: root-class ( class -- root )
    dup class_getSuperclass [ root-class ] [ ] ?if ;